to illustrate what Ian wrote, with your example:
https://go2goplay.golang.org/p/YTqF-WS0m6O
func main() {
var ps = []*Person{
&Person{"Arthur Dent", 42},
&Person{"Zaphod Beeblebrox", 9001},
}
Print(ps) // ok.
Printi(ps) // compilation error.
}
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Wednesday, December 23rd, 2020 at 7:02 PM, Ian Lance Taylor
<i...@golang.org> wrote:
> On Wed, Dec 23, 2020 at 9:54 AM wilk w...@flibuste.net wrote:
>
> > https://go2goplay.golang.org/p/fTW3hJYNgfU
> >
> > type Stringer interface {
> >
> > String() string
> >
> > }
> >
> > Print[T Stringer](s []T)
> >
> > Print(s []Stringer)
> >
> > Both forms works.
> >
> > How to prevent double way to do the same things that can be confusing ?
>
> Both forms work but they mean two different things.
>
> Print(s []Stringer) takes a slice of the type Stringer.
>
> Print[T Stringer](s []T) takes a slice of some type T, where T
>
> implements Stringer.
>
> For example, if MyInt implements Stringer, and I have a []MyInt, then
>
> I can call Print[T Stringer](s []T) but I can't call Print(s
>
> []Stringer), because a []Stringer is not a []MyInt.
>
> Ian
>
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